Peter t



(No Model.)

P. T. GUFFIELD.

FORGE PUMP.

Patented Apr. 17,1883.

N, PETERS. Phummhographcr, wasningmn. D. c.

lINrrEn STATES PATENT t OFFICE.

PETER T. COFFIELD, OF SPRINGFIELD, OHIO, ASSIGNOR OF ONE-HALF TO CHARLESH. PAXSON, OF SAME PLACE.

FORCE-PUMP.

SPECIFICATIO'Nforming part of Letters Patent No. 276,134, dated April17, 1883.

Application filed July 6,1882. (No model.) y

To all whom t may concern:

Be it known that I, PETER T. COFEIELD, a citizen ofthe United States,residing at Springiield, inthe county of Clarke and State of Ohio,

have invented certain new and useful Improvements in Force-Pumps, ofwhich the following is a full, clear, and exact description.

My invention relates to that class of forcepumps known as doublecylinder forcexo pumps,7 and my object is to simplify the construction,and at the same time render the pump cheaper and more reliable thanlothers ofthe same class.

The novelty of my invention consists, first,

in the arrangement of the two piston-cylinders of unequal diameter uponone straight waterdelivery stem or stock, with au airchamber arrangedbetween the two cylinders or at a point above the valve communicatingwith the 2o lower chamber; secondly, in the construction and arrangementof the ports and valves, whereby a stuffing-box for the pump-rod isdispensed with; thirdly, in the combination, with the discharge-tube orpump-stock, of an inclosed tube extending from the top of said stockdown through the same into the upper piston-cylinder; fourthly, in thecombination, with the pum p-stock and upper piston-cylinder, of awater-passage extending from the lower 3o end of said cylinder up intosaid stock; lifthly, in details of construction and combination of theparts, all as will be herewith set forth and specifically claimed.

In the accompanying drawings, Figure l is 3 5 a side elevation of myimproved pump. Fig. 2 is an enlarged rear elevation in section oftheoperating parts and their connections. Figs. 3 and I are centralsectional side elevations of the upper piston-cylinder and connections.

Fig. 5 is a detail view of a modification in the arrangement of thecylinders and air-chamber.

Figs. 6 and 7 are modifications of the double cylinder for shallowwells.

The Same letters refer to like parts in all th I figures.

cured upon the well-platform E, so that it can be raised or lowered tosuit the height of the water in the well in the following manner: Acollar, F, Fig. 1, is fitted upon the stock A and 53 secuied to theplatform by bolts or screws. The stock A, passing through this collar,isheld by set-screws or bolts c, extending through the collar andbearing against the stock. By loosening these screws the stock, with the6o pum p-cylinders and attachments,cnn be raised or lowered, and can bethen reclamped in the adjusted position. f

G is the upper and smaller pump-cylinder, having a ange at its upperend, by which it is bolted to a flanged head-piece, Il, which is screwedupon or secured to the lower end ot' the stock A, as shown. Opening fromthe lower end of the cylinder G is a passage-way 0r outlet, I, whichextends up alongside the 7o cylinder and opens into the head H. Theopening in the head H communicates with the bore of the stock A. Now,passing centrally down through the head B and the stock A is a smalltube or pipe, J, which is open at both ends, but is secured withwatcr-tightjoints at the top tothe head B by the nut b, and at thebottom by being screwed into the head of the cylinder G. Through thistube J the pumprod K passes from the operating-handle down 8o into thecylinder G, and carries the piston L, which works in the cylinder G. I

Extending centrally from the bottom ofthe cylinder G is the pipe M,carrying at its bottom the larger pump-cylinder N, intowho'se 85 top itis secured. This lower cylinder is of about double the capacity of theupper cylinder, and it is provided at its bottom with any suitableupwardly-opening valve, O, and with a strainer, P, of such constructionas to prevent foreign objects being drawn into the cylinder. Itisintended, of course, that this lower cylinder shall be submerged inthe water of the well. The pump-rod K is extended from the piston L, andpasses down through the pipe M into the cylinder N, and carries theperforated piston R of said cylinder. The piston R is provided with theusual or any suitable dropvalve, S. The pipe M carries at or about itsmiddle a laterally-extending hollow coupling, 1GO T, Fig. 2, .into whichthe air-chamber U is secured. This air-chamber is a straight pipe,

closed at its upper end and lying close to and parallel with thecylinder G, as shown. By means of the hollow coupling T it has freecommunication with the pipe M, and consequently with both cylinders. Atthe upper end of the cylinder G one or more small apertures, c, Figs. 2and 3, are provided to allow the escape of any water which might byaccident or leakage get above the piston L. `It will be readily seenfrom the above-described construction that a continuous even flow ofwater is kept up on both the up and down strokes of the pump-rod, owingto the fact that the lower cylinder is of double the capacity of theupper cylinder and the interposition between the two cylinders of theair-chamber.

0n the downstroke of -the pump-rod the piston L forces the water out ofthe cylinder G through the passage I, and up through the stock A aroundthe pipe J; and on the upstroke the piston R forces up enough water toillthe cylinder G and keep up the pressure through the passage I, owingto the fact that it forces up twice as much water as could be containedin the cylinder G. By means of this arrangement of the cylinders, and byforcing the water ont of the cylinder G at its lower end, and by theemployment of the tube J, I am enabled to entirely dispense with astungbox for the pump-rod, since no water can get above the piston Lwhen said piston tits the cylinderproperly. It'desired,themodificationshown in Fig. 5 may be employed, where I have dispensed with theintermediate pipe, M, and have directly united the twopumping-cylinders,and have placed the air-chamber elbow below'the lowercylinder but above the inletvalve. By this modication the same mode ot'operation and result are obtained. In Figs. 5 and 7 is shown amodification of the double cylinder, to be used in shallow wells as asuc-l tion-pumpinstead of a lifting-pump. The upper smaller cylinder issecured into the chamber and extends downward into the larger cylinder.The water passes around the smaller cylinder through the chamber intothe discharge-pipe. l

Having thus fully described my invention, what I claim is- 1. Incombination with a force-pump, a tube connecting the head ofthe pump tothe upper cylinder, passing centrally through the waterdelivery stock ofthe pump, and being open at both ends for the purpose of passing the rodthrough it, and at the same time cutting o' communication of the waterwith the pumprod, substantially as described.

A. tubo passing centrally through the water-delivery pum p-stock, incombination with a cylinder having a passage or branch conducting thewater from below the piston L into a chamber above the same, having anoutlet into the stock ot the p^nmp,`substantially as described.

3. In a double-acting force-pump, thecombination, with the delivery-pumpstock having a central tube for the passage of the pumprod, of twopumping-cylinders concen tric with said pump-stock, the lower one ofwhich is ot' larger diameter than the other, and with thcdischarge-passage extending from the lower end of' the upper cylinder upinto the concentric pump-stock, substantially as and for the purposespecified.

4. In a double-acting force-pump, the combination, with thewater-delivery stock having a central tube containing the pump-rod, oftwo pumpingcylinders concentric with tho pumpstock, the lower one ofwhich is of larger diameter than the upper, and the upper one ot' whichhas its discharge-passage opening from its lower end into thepump-stock, and an airchamber communicating with said cylinders at apoint above the lowerl inlet-valve, substantially as and for the purposespecified.

5. In a double-acting force-pump such as described, the upper cylinder,G, having an outlet-passage, I, extending from its lower end and up intothe concentric waterdelivery pump-stock, substantially as described.

6. In a double-acting force-pump, the concentric arrangement ot' thewaterdelivery pump-stock, the two pumping-cylinders, the pump-rodconfining-tube, and the pump-rod, substantially in the manner and forthe purpose specified. Y

PETER T. COFFIELD. Witnesses:

GUs A. MEYER, J ERE. F. TwoHIG.

